There is an infinite number of common multiples for 9 and 8. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
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If this means "what is x when 8x = 9x?" then there is no answer in this Universe. If you want common multiples of 8 & 9 then 72 and all its multiples. (8 & 9 are examples of xy and yx.)
the common multiples are most all of the multiples of 8
72, 144 and 216
Common multiples of 9 and 10 are all of the multiples of 90.
The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27